Op portsmouth



(No Model.)

L. D. YORK.

MACHINE POR DRAWING METAL BARS- No. 335,496 atented Feb. 2, 1886.

UNITED STATES Par-nar Ottica.

LEVI D. YORK, OF PORTSMOUTH, OHIO.

MACHINE FOR DRAWING METAL BARS.

SPECIFICATION forming part of Letters Patent No. 335,496, dated February 2, 1886. Application tiled July ll,1S85. Serial No. 171,300. (No model.)

To all whom it may concern,.-

Be itknown that I, LEVI D. YORK, of Portsmouth, in the county of Scioto and State of Ohio, have invented a certain new and useful Improvement in Drawing-Machines, of which the following is a specitcation.

My improvement relates to machines einployed in drawing bars of metal.

I will describe in detail a drawing-machine embodying my improvement, and then point out the novel features in claims.

In the accompanying drawings, Figure l is a plan or top View, partly in section and part being broken away to save space, of a drawing-machine embodying myimprovement; and Fig. 2 is a transverse section of the drawhead,taken on the plane of the linexx, Fig. l.

Similar letters of reference designate corresponding parts in both figures.

A B C designate the frame of the machine. It is made of metal, and is secured to a suitable support by bolts or otherwise. Slideways a extend longitudinally along the inner edges of the side portions, A, of the frame. In the present instance these slideways consist of grooves. The' upper portions of these slideways are formed by detachable plates bolted to the frame. The end portion B ofthe frame is recessed to receive die-blocks b. Dies care secured in the die-blocks in the usual or any suitable manner,preferably by means of straps b, bolted to the end portion B, and having apertures through which the dies c extend. Openings d in the end portion B ofthe frame, opposite the dies e, communicate with the ap ertures extending through the dies.

D D designate screw-shafts journaled in bearings upon the end portions B C of the frame, and extending longitudinally thereof and parallel with each other. The bearings for said screws in the portion B of the frame consist of sockets which receive turned ends upon the screws. The bearingsin the portion C of the frame consist of annular grooves formed partly in said end portion C and partly in caps m, constituting portions of the bearings. Corresponding annular rings, yr, upon the screw-shafts enter said grooves. By this means endwise movement of the screw-shafts is prevented. The caps m are bolted or otherwise secured to the frame about the shafts.

. side portions, A, of the frame.

The screw thread upon one of the screwshafts D D is right-handed, and that upon the other left-handed.

E desigraes a draw-heid. The ends ofthis draw-head engage with t-he slideways a in the The drawhead is thereby guided in its movements. A to-and-fro movement is imparted to the drawhead by means of the screw-shafts D D, the vdraw-head being provided with hollow screwthreaded nuts s to receive them. These nuts are preferably of brass, and are cut away upon their under sides to accommodate the usual rests for the shafts. (Not shown in the drawings.)

F F F2 designate grippers. As these grippers are alike,l will describe but one. I have more clearly illustrated one of these grippers in Fig. 2. It is composed of two parts, d' d2. One end of the part d is bent downwardly,so as to form, as it were, a hook, e. The corresponding end of the part d2 is bent upwardly, forming a corresponding hook, e. These parts d d2 tit within grooves f, extending transversely of the draw-head E, and when in such position the hook-like portions c e' extend about the draw-head E at the rear side thereof,or side farther from the dies. They thereby sustain the longitudinal strain upon the gripper when a rod is being drawn. The other ends of the parts d d2 extend toward each other, and are provided with grooved faces, preferably of steel, and tile-cut, constituting jaws. A rod to be drawn is gripped between these jaws.

G designates a link embracing the parts d d2 of the gripper near the jaws thereof. By adjusting a set-screw, g, fitting in a tapped hole in the link G, and bearing at its inner end against the part d of the gripper, bars of different sizes may be gripped by the jaws and trmly held. Motion is imparted to the screwshafts D D by means of pulleys H I upon a portion of the screw-shaft D. Both these pulleys are loose upon said shaft. J designates a cone for operating clutches upon the pulleys H I. This cone is adapted to be shifted by a lever, L. Clutch-fingers 7i z' upon the pulleys H I are adapted to be operated bythe cone to engage the pulleys with the shaft. These pulleys are rotated in reverse directions.

IOO

When the cone is moved sufficiently far in one direction, the pulley H rotates the shaft D. When 'the cone is moved sufficiently far in the opposite direction, the pulley I rotates said shaft. Vhen the pulley H rotates the shaft, both shafts then rotate to move the drawhead E backward, or, in other words, to draw the rod or rods being drawn. When the pulley I rotates the shaft, the screw-shafts are rotated to move the draw-head forward or to the starting-point.

I will now describe a simple means by which motion may be transmitted from the shaft D to the shaft D. Said means consists in gearwheeis K K', mounted one upon each of said shafts. They are shown as having V-teeth inclining in reverse directions from the oenter toward the peripheries.

One object in using two screw-shafts is,that I am enabled to draw one, two, or three lbars at a time, as desired. Another object is, that by using` two screws the strain is equalized, either when drawing more than one bar at a time or in drawing one only, the strain with my machine being always uniform, irrespective ofthe number ofbars being drawn. The screws, operating in unison, prevent the drawhead from canting or binding along the slideways.

In drawing one bar I prefer to draw it with the middle gripper, F. When two bars are drawn at once, I use the two outside grippers, F F2, and of course in drawing three bars employ all three grippers. Bars of different sizes may be drawn at the same time, if desirable, in which case, however, the largest bar would be drawn through the middle die, so as to get the greatest strain at the center of the draw-head. What I claim as my invention, and desire to secure by Letters Patent, is

1. |In a drawing-machine, the combination, with a draw-head, of grippers on said drawhead, a number of dies arranged opposite the grippers, and two shafts for imparting motion to the draw-head, one of which shafts is provided with a right-handed screw-thread, and the other with a left-handed screw-thread,said shafts being geared directly together and operating in unison, substantially as specied.

, 2. The combination, with the screw-shafts DD', of the draw-head E and the grippers F y F F2, substantially as specied.

LEVI D. YORK.

Witnesses: EDWIN H. BROWN, DANIEL H. DRIscoLL. l 

